报告题目：Electromagnetic particle-in-cell modeling of surface wave phenomena in radio-frequency and microwave discharges

报告人：Denis Eremin

报告时间：2025年10月9日星期四上午10:00-11:30

报告地点：物科楼101室

报告邀请人：徐亮

报告摘要：Excitation of surface waves influences the physics of many plasma discharges vital for technological applications. In some discharges such waves sustain the plasma itself, in others they are masked by other phenomena and start manifesting themselves only at large plasma densities, driving frequencies, or electrode sizes, when reactor dimensions become comparable to the surface mode wavelength or skin depth. Typically, surface waves propagate along a boundary between two media, one of which is a dielectric or electron-depleted plasma sheath, and the other is an overdense plasma with a negative dielectric permittivity at the driving frequency. Often, there is another conducting surface behind the dielectric layer. The surface waves may be desirable if they help maintain plasma discharge, or detrimental as they lead to nonuniformities of the ion fluxes at electrodes. As many discharges utilized for technological purposes are operating at low neutral gas pressure, it is important to take into account kinetic and nonlocal effects, which can be done by employing the particle-in-cell method. This talk will discuss the energy- and charge-conserving electromagnetic particle-in-cell (PIC) code ECCOPIC2M employed for investigation of the surface mode excitation and interaction with electrons, leading to their heating.

报告人简介：Denis Eremin is a senior researcher at the Institute of Theoretical Electrical Engineering, Ruhr University Bochum. He earned his BS from the Novosibirsk State University (1996) while working at the Budker Institute of Nuclear Physics, and PhD from the University of Texas at Austin (2004), while working at the Institute for Fusion Studies. From 2005 to 2009 he stayed as a postdoc at the Max Planck Institute for Plasma Physics in Greifswald. Since 2009 he conducts research and teaches at the Ruhr University Bochum. His main research interests are kinetic (particle-in-cell) simulations of various plasma discharges utilized in plasma processing and propulsion applications, related numerical algorithms, and high-performance computing (HPC) techniques used for their parallelization, in particular with help of graphics processing units (GPUs).